Explain the purpose of applying multiple regression analysis. Following table shows the scores ($Y$) made by ten assemblies –line employees on a test design to measure the job satisfaction. It also shows the scores made on an aptitude test (X1​) and number of days absent (X2​) during the past year (excluding vacation).

Y	64	70	85	50	60	72	75	55	80	70
X1​	6	6	9	5	6	7	8	6	8	6
X2​	2	1	0	8	2	1	5	9	1	1

i) Find the multiple regression equation for the sample data.
ii) Interpret the value of regression coefficients b₁ and b₂.
iii) Estimate the score of an employee whose aptitude test score is 9 and number of absent days are 6.